An unresolvable problem occurred while calculating the upgrade:
%sThis can be caused by:* Upgrading to a pre-release version of Ubuntu* Running the current pre-release version of Ubuntu* Unofficial software packages not provided by Ubuntu

FIXME: change the text to something more useful

represents a line break.
Start a new line in the equivalent position in the translation.

represents a space character.
Enter a space in the equivalent position in the translation.